Jack



Sept. 3, 1946;

A. E. w. JOHNS ON ETAL 2,4 7,080v

JACK Filed March 8, 1945 2 Sheets-Sheet 2 Patented Sept. 3, 1946 JACK Arnold E. W. Johnson, Oak Park, and John R.

Orelind, Wilmette, Ill., assignors to International Harvester Company, a corporation of New Jersey 2 Claims.

This invention relates to a new and'improved tractor jack with finger-tip control and is an improvement over pending applications having Serial No. 472,619, filed January 16, 1943, for Repair apparatus for vehicles, now Patent No. 2,380,313.0f July 10, 1945, and Serial No. 466,463, filed November 21, 1942, for Power adjusting mechanism, both of these and the subject application being assigned. to the common assignee,

2 closures in the following specification and accompanying drawings, in which: f

Figure 1 is a side elevation of a tractor incorporating the tractor jack with finger-tip control:

Figure 215 a rear elevational view of the structure shown in Figure 1, the View showing one of the wheels in section; and

Figure 3 is a View similar to Figure 1 of a com bined jack and implement.

I ter ti Harvester Company, As shown in the drawings, reference numeral 11-, i an important object of thi tion to lo indicatesgenerally a tractor of the usual type provide a jack especially adapted for tractors or having a Chassis 2 p which is l fi a the Ill; and vghich is actuated by power supplied If l l 'i and D i 31 ffil $12 5 1 mm 9 me 013 e rear ax es are ourna e W1 1n caring Jacks are employed on tractors and other members 3 a d pp r large Wheels 2 Which vehicles of this nature for the several purpose of Ordinarily a p y agricultural tractorsvarying the wheel spread, to switch the wheels, The Wheels 29 are of the concave-convex disk or to make tire repairs. A tractor is generall a gm hag/111g a hub pi 22, as z z z iz fl l very heavy vehicle, and the wheels employed an an rim mem e thereon are of a size incapable of being handled 20 f h yp Ibis, Of course, Understood that conveniently. As disclosed in our previous apthls wh a d ass m Iy may be f any nst u plication entitled Repair apparatus for vehicles, tion desired and t necessarily s w A having Serial No. 472,610, the jacks shown therein pneumatic the is mounted on the Tim member were capable of lifting the tractor wheel from the it u b t d th t th 1 b s ground and in addition supplied a mean .of re- 25 W1 9 e a e ax e mem 8145 are moving the raised Wh el from its position on the elongated permit Various Wheel Spreads tractor axle. The other application mentioned g g i g g gai a i g ig above, namely, Power ad'ustin mechanism, a a y p n e having g NQ 465463, diregcted hi fl to Thesetractor wheels are quite larg and cumber pose 0 ma in avai a e accura n ertrol f the i power lift gg i i zfi are repositioned at some new point on their axles requirements of a tractor jack is that it be or entirely removedfor the several purposes of capable of lifting within minute predetermined changmg sldes' i g airound a limits, and, inasmuch as the jack is directly opert cmlved lportlon w 86 ppofil 0 ated by the tractor power take-oil lever, it is Its m1t.1a1p acfamen .i remove e w ee necessary to have complete control over the make f r shownu; our prewamount of movement of this power take-off lever. ous f g g havmg .Senal i g To this end, the finger-tip control lever is posig g P J i? 5 ar tioned within reach of the tractor operator and r; gggf Z2 E 3 5 1; the controls are so calibrated that a specific moveby means 5 of onposed c shaped claims ggge g gzifisg g fil Z3 2 iifi i ggzi' 32 and 34. "Ifhe clamp member 32 is welded or I th t k p otherw se rigidly attached to the sleeve 30 at n spas ipower fi levers assPcmted W 36 and has lunged thereto at 38 the opposing tractors were not capable ofaccurate intermediate clamp memberv An adjustable bolt 49 permits stopping and quite often were only capable of full the upper portigns of t clamp members 32 and movement between their extreme operating posi- 34 t b drawn tightly together so as to be firmly tlcnsattached to the axle housing It. The jack fur- Therefore, a further impo tant object of this ther include a horizontal extension 42 of the invention is the provision of a tractor jack in standard 28, which acts as a boom for the recepcombination with a finger-tip control which tion of a roller 44 having a shaft 46 therethrough causes the jack to be locked in any position. terminating in a crank 48. A bail 50 is carried Other and further important objects of this by the shaft 46 and has its bight portion disinvention will become apparent from the disposed below the boom 42 provided with an eyeolt 52. The means for connecting the bail 50 to th tire and wheel assembly or to the tire alone preferably takes the form of a pair of tongs 54 comprising elements 56 and 58. These tongs 56 and 58 are best shown in Figure 2, wherein they are in engagement with the rim 24 of the wheel 20. It will also be noted that the pivot 56 between the elements 56 and 56 is directly below the roller 44 and that the vertical line between these two points is laterally offset toward the corn cavity of the wheel 20. The arms of the elements 56 and 58 extend beyond the intersection thereof and are connected to the eye-bolt 52 preferably by means of a pair of flexible chains 60 and 62. The chain 62 is somewhat shorter than the chain 60, thus assisting in the lateral offset location of the tong assembly with respect to the wheel assembly. Turning of the crank 48 causes the carrier assembly to move laterally inwardly or outwardly on the boom 42 and, when the wheel 20 is loosened from the axle I6, the wheel assembly is carried along. As will be see in Figure 2, the boom 42 i sufficiently long so that the wheel assembly may be entirely removed from the aXle I6, in which position it may be removed from the tractor or retained in its carried position and spun around and reengaged with the axle I6 opposite to its original position now having the concave side of the wheel positioned outwardly.

The jack is operated by means of a power lift arm 64, which is regular equipment on agricultural tractors of the type shown, and such an arm is positioned on both sides of the tractor. As shown in Figure 1, the arm 64 pivots about the shaft 66, which is journally supported within the chassis I2. The arm 64 is ordinarily capable of movementthrough an angle of approximately 180, and it is the utilization of this movement that is here adapted to operate the jack. Many mechanical means may be employed between the arm 64 and the jack to cause the chassis I2 and the sleeve 30 to move reciprocably on the jack standard 28. The particular method shown is merely one of many forms which are shown in more detail in our previously filed case entitled Repair apparatus for vehicles and already mentioned herein. A bell-crank lever 68 has angularly spaced arms I and I2 joined by the fulcrum I4. The arm I2 is pivotally attached at I6 to an apertured lug 18 on the vertical standard 28. The arm is pivotally attached to a connecting rod 80 at 82, and the arm at its other end is pivotally attached to the arm 64 at 84. A link 86 pivotally connects the fulcrum I4 of the bell-crank 68 to the pivot point 68 on the lug 90, which is an integral part of the sleeve 30. The levers, as just described, may be a single set or may be arranged in pairs to increase the strength of the jack.

Heretofore, mechanisms have been employed to actuate the power-lift arm 64, but most of these have been restricted to full movement of the arm between its extreme end positions, and generally no provision was made for intermediate stops of the arm. If intermediate stops of the power-lift arm were available, no accurate means were ever provided to stop the arm at some predetermined desired position. The above mentioned application on Power adjusting mechanism, Serial No. 466,463, sets forth an easily operated finger-tip lever which, upon being moved through its arcuate range, causes an equal arcuate movement of the power arm 64. Provision is made in that mechanism for providing positive locking means of the arm 64 at whatever point the finger-tip lever is stopped. A like finger-tip lever 92 is pivoted at 94 and is capable of moving across the arcuate scale 96, which is accurately calibrated and positioned in close proximity to the operator of the tractor so that he may easily make any desired movement of this finger-tip control lever 92. An extension 98 of the lever 92 beneath the pivot point 94 engages a link arm I00, which in turn pivotally engages an arm I02 and pivots it about a point I04 so that a lower end I06 of the arm I02 conwill sufiice.

trols a valve actuating means including a member I08 associated with an hydraulically operated device including a cylinder member H0. The member I08 is so adjusted that a movement of the finger-tip lever 92 causes an opening or closing thereof and permits greater or less movement of the piston (not shown) within the hydraulic cylinder IIO. Movement of the piston causes a direct movement of the arm 64. Pro Vision is also made within this hydraulic mechanism to positively lock the piston in its ultimately assumed position, as determined by operation of the valve I08 by the finger-tip lever 92.

The combining of the finger-tip control with the tractor jack, as disclosed herein, is novel inasmuch as it produces a long sought-after device capable of much greater precision as required for tractor jacks in order that they be used successfully. It is now possible to accurately raise one wheel of the tractor to any predetermined height. Such a condition is very desirable inasmuch as the tractor wheels are so very heavy it is necessary, when mounting or dismounting them, to have the axle at the exact height for sliding of the wheel on or off without the necessity of lifting it. The calibrated fingertip control enables the operator to adjust the axle at just this proper height. Certainly the devices that were limited only to full arcuate movement of the power-lift arm were not adapted to the operation of tractor jacks, nor were the devices that were capable of intermediate stopping of the power arm to be successfully utilized with a tractor jack, for the reason that the axle height could not be adjusted to any predetermined height without much running back and forth in attempting to get the power arm in the right position. It is to be understood, of course, that specific details of the type of power-operated mechanism are not disclosed, because they are not an integral part of this invention, but rather any device that permits accurate finger-tip control of the power-lift arm above mentioned application having Serial No. 466,463.

Figure 3 shows a cultivating implement II2 having earth-working tools I I4, which are adapted to penetrate relatively soft ground and so prepare it for proper crop raising. The imp1ement H2 is directly mounted on the tractor I0 somewhat similarly to the mounting of the jack standard, as shown in Figure 1. A bracket H6 is attached at II8 to an-axle housing I20, shown as a square in cross section in contradistinction to the circular housing I8 shown on the tractor in Figure 1. A pair of lever arms I 22 and I 24 are pivoted respectively to the lower and upper portions of the bracket H6 at I26 and I28. The other ends of the arms I22 and I24 are pivoted to a bracket I30 at the points I32 and I34, respectively. The cultivator H2 is bolted or otherwise attached to the shaft I36, which forms a unitary part of the vertical bracket I30. A link For details of such a device, see the arm I38, connected to the arm e4 at one end, pivots about a point I40, which point forms an arc described by a connecting link I42 pivotable about its lower end at the point I28 on the bracket II6. A link arm I44 interconnects the bracket I30 by connection at a point I46 with the arms I38 and I42 at their pivot point I40. A sleeve I48 is slidably adjustable along the length of the link arm I44 and has an integral bracket I50, which is adapted to receive a pin through an aperture therein at the point I40 to thereby join the three members I38, I42, and I44. The depth that the cultivator is capable of attaining is controlled by adjusting the sleeve I43 either higher or lower on the link arm I44.

As shown in Figure 3, the ground level is at I52, and the tractor wheel 20 is raised therefrom. This conditionhas arisen, because the ground I52 is so hard that the cultivator tools II4 cannot penetrate and, inasmuch as there is a direct linkage connection between the power-lift arm 64 and the tools II4, the tractor itself then raises. Hence, this cultivator implement acts in place of a jack when used on ground hard enough to prevent penetration of the cultivator tools. Generally, ordinary earth is not packed solidly enough to resist penetration of implement tools, so the tractor is run onto some hard flooring, such as concrete or the like, and the finger-tip lever 92 moved along its arcuate scale to any desired point, and the rear wheels of the tractor ar thereby raised or lowered, as required. It will be seen that the implement performs all the functions of the jack disclosed in Figures 1 and 2, except for the lifting and carrying of the wheel by means of the tongs 54 suspended from the boom 42.

I-Ieretofore, resilient means have been employed intermediate the direct linkage connection between the power-lift arm 64 and the implement tools II4, so that, upon actuation of the arm 64 when the tractor is raised on some firm support, the linkage could b reduced in length to prevent injury of the tools. In the construction shown in Figure 3, such resilient or yieldable member has been entirely removed so that the tools do not give, and the result will be a lifting of the rear end of the tractor.

We have developed a practically operable tractor jack capable of commercial adaptation for the sole reason that it is provided in combination with the finger-tip control, permitting operation thereof in minute increments, and we do not intend limiting the patent granted thereon otherwise than as necessitated by the appended claims.

What is claimed is:

1. In a tractor having a power source comprising a swingable work arm, a hydraulic device adapted to cause swinging movement of said work arm, a control lever, actuating means associated with said hydraulic device, linkage between said control lever and said actuating means, the tractor having a jack means, said jack means comprising a standard, sleeve means affixed to the tractor through which said standard slides, a bell-crank lever having angularly spaced arms and a fulcrum therebetween, the arms connecting the said standard to said work arm, and a link pivotally attached to said sleeve means and the fulcrum of said bell-crank lever, whereby movement of the control lever causes the tractor to be raised or lowered with respect to said standard.

2. In a tractor having a power source comprising a swingable work arm, a control lever for effecting regulated movement of said work arm by said power source, a jack means for the tractor, said jack including a standard, sleeve means affixed to the tractor and forming a rigid structure therewith through which the standard slides, a bell-crank lever having angularly spaced arms and a fulcrum therebetween, the arms connecting the standard to the work arm, and a link pivotally attached to said rigid structure and the fulcrum of the bell-crank lever, whereby movement of the control lever causes the tractor to be raised or lowered with respect to said standard.

ARNOLD E. W. JOHNSON. JOHN R. ORELDID. 

